Rare earth‐based perovskites have become an attractive research interest in the field of cryogenic magnetic refrigerants due to their unique advantages in practical applications. The remarkable magnetocaloric effect (MCE) renders EuTiO3 a potential magnetic refrigerant in the liquid helium temperature range. More impressively, the tunability between antiferromagnetism (AFM) and ferromagnetism (FM) provides the feasibility of tailoring the magnetism and enhancing the magnetocaloric performance. In this study, the magnetism of EuTi0.75Al0.125Zr0.125O3 is investigated in depth through first‐principles calculations and experimental methods. Both theoretical calculations and experimental results reveal that it exhibits significant ferromagnetism due to the AFM‐FM magnetic transition promoted by the co‐substitution of Al and Zr. Lattice expansion and altered electronic interactions are responsible for the FM behavior, which leads to a significant enhancement of the MCE. With the field change of 0−1 T, the peak values of magnetic entropy change (−ΔSM), refrigerating capacity (RC), and adiabatic temperature change (ΔTad) reach 18.9 J kg−1 K−1, 77.7 J kg−1, and 7.4 K, respectively. More surprisingly, the values of maximum magnetic entropy change () and maximum adiabatic temperature change for EuTi0.75Al0.125Zr0.125O3 reach 11.4 J kg−1 K−1 and 3.7 K under the field change of 0−0.5 T, respectively. The remarkable magnetocaloric performance proves it to be a brilliant magnetic refrigerant operating near liquid helium temperature.

中文翻译：

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一种在液氦温度附近工作的出色磁性制冷剂：铁磁性 EuTi0.75Al0.125Zr0.125O3 中增强的磁热效应


稀土钙钛矿由于其在实际应用中的独特优势，已成为低温磁性制冷剂领域的一个有吸引力的研究兴趣。显着的磁热效应（MCE）使EuTiO3成为液氦温度范围内潜在的磁性制冷剂。更令人印象深刻的是，反铁磁性（AFM）和铁磁性（FM）之间的可调性提供了定制磁性和增强磁热性能的可行性。本研究通过第一性原理计算和实验方法对EuTi0.75Al0.125Zr0.125O3的磁性进行了深入研究。理论计算和实验结果都表明，由于Al和Zr的共取代促进了AFM-FM磁转变，它表现出显着的铁磁性。晶格膨胀和改变的电子相互作用是造成 FM 行为的原因，这会导致 MCE 的显着增强。随着磁场变化0−1 T，磁熵变(−ΔSM)、制冷量(RC)和绝热温度变化(ΔTad)的峰值分别达到18.9 J kg−1 K−1、77.7 J kg−1 、 和 7.4 K 分别。更令人惊讶的是，在0−0.5 T的磁场变化下，EuTi0.75Al0.125Zr0.125O3的最大磁熵变()和最大绝热温度变化值分别达到11.4 J kg−1 K−1和3.7 K。卓越的磁热性能证明它是一种在液氦温度附近工作的出色磁性制冷剂。